Penn State Extension

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Winterberry holly Photo: Mike Masiuk, Penn State
Why Doesn't My Holly Have Berries? - Articles Articles
Lack of berries on holly is a common concern for home gardeners. This article identifies some of the reasons and possible solutions. More
Spotted Lanternfly: What to Look For
Spotted Lanternfly: What to Look For - Articles Articles
Spotted Lanternfly, Lycorma delicatula, is a new threat to Pennsylvania and the United States, and experts are still learning how to combat it. More
Overall picture of white oak impacted by cynipid wasp galls. Photo: Sandy Feather, Penn State
Cynipid Wasp Galls: Making A Mess of White Oaks - News News
The Extension office received a sample of damaged white oak leaves from the North Hills of Pittsburgh. Given the amount of rain we have had all year, anthracnose was a possible suspect. More
Dwarf cherry tree after a snow fall
Winter Berries and Shrubs that Create Winter Interest - Workshops Workshops
Bradford/Sullivan County Free Public Class for July. More
Pollinator Garden
Spring Blooms: Small Trees and Native Perennials - Workshops Workshops
Learn about perennials you can plant in your own garden, and which plants have the highest ecological value. More
Close-up of fringetree flowers which have some fragrance to them. Photo: Mike Masiuk, Penn State
Spring Floral Display: Chionanthus Virginicus, White Fringetree - Articles Articles
Although the common name, white fringetree, alludes to a tree, it is often treated as a large shrub in the landscape, reaching a range of anywhere from 12 to 20 feet. More
Removing the burlap prior to setting the balled tree. Photo: Tim Abbey, Penn State
Review of Successful Tree and Shrub Planting - News News
During my twenty-four year career, the most common tree problem that I encounter isn’t an insect or a disease—it is us. More
Winterberry fruit. Photo credit: Mike Masiuk
Shrubs and Trees for the Winter Landscape - Articles Articles
Look for trees and shrubs that could beautify your property and nurture wildlife during the winter months. More
Stay Alert for Oak Wilt!
Stay Alert for Oak Wilt! - Articles Articles

Stay Alert for Oak Wilt!

Sandy Feather

Oak wilt was not known in New York before 2008, but foresters and arborists are managing it there now. More
Gerald J. Lenhard, Louisiana State University, Bugwood.org
Tree Fruit Insect Pest - Yellownecked Caterpillar - Articles Articles
The yellownecked caterpillar is a key pest of shade trees. This insect is also destructive on the foliage of blueberry, apple, and other fruit trees. More
Extendiendo la Temporada Productiva con Túneles Altos
Extendiendo la Temporada Productiva con Túneles Altos - Articles Articles
Los túneles altos ofrecen protección a las plantas de tierras saturadas de humedad y temperaturas bajas en la primavera y el otoño con lo cual se extiende la temporada productiva. More
Stigmina Leaf Spot. Photo by Joseph OBrien, USDA Forest Service, Bugwood.org
Tree Diseases - Articles Articles

Tree Diseases

Tim Abbey

Living in the humid mid-Atlantic area, we have lots of fungal and bacterial diseases to contend with. More
Native Plants for Green Industry Professionals: Trees
Native Plants for Green Industry Professionals: Trees - Workshops Workshops
This workshop will introduce landscape professionals to common and underused native plants suitable for a variety of residential and commercial applications. More
Acer rubrum Red Sunset® on a commercial site with suspected glyphosate damage. Photo: S. Feather, Penn State
Use Glyphosate With Care Near Trees! - Articles Articles
Glyphosate is the active ingredient in non-selective, systemic herbicides sold under a variety of trade names – Round Up, Accord, Glypro, and many others. More
Arborist Short Course
Arborist Short Course - Workshops Workshops

Arborist Short Course

Multiple Options Available

From: $250.00

To: $275.00

Attend this four-day course to prepare for the ISA Certified Arborist exam and improve your marketability! More
Four-lined plant bug adult. Photo: S. Feather, Penn State
Four-lined Plant Bugs Are Active Now - Articles Articles
Four-lined plant bugs, Poecilocapsus lineatus, become active in May. More
Black walnut fruit. Photo: K. Salisbury, Penn State
Working With the Black Walnut - Articles Articles

Working With the Black Walnut

Kathleen V. Salisbury

Black walnut is one of the last trees to leaf out in the spring and one of the first to lose its leaves in the fall. More
Organic Land Care Best Management Practices Manual
Organic Land Care Best Management Practices Manual - Articles Articles
This free manual provides recommendations to land managers and landscape contractors on best management practices for effectively conducting organic land care. More
E. Richard Hoebeke, Cornell University, Bugwood.org
Viburnum Leaf Beetle - Articles Articles

Viburnum Leaf Beetle

Steve Jacobs

An invasive species, the viburnum leaf beetle has the potential to become a serious problem in nurseries and landscapes in Pennsylvania. More
Gerald J. Lenhard, Louisiana State University, Bugwood.org
Tuliptree Scale - Articles Articles
The tuliptree scale is a pest of yellow poplar, or tuliptree, magnolia, and linden. This soft scale insect is so prolific that it can cover twigs and branches. More
Whitney Cranshaw, Colorado State University, Bugwood.org
Snailcase Bagworm - Articles Articles
The snailcase bagworm is a moth (family Psychidae) that was accidentally introduced into the United States from Europe in the 1940s. More
Kira Metz, USDA APHIS PPQ, Bugwood.org
Powderpost Beetles - Articles Articles
Powderpost beetles breed in dead and dried hardwoods. Their presence is overlooked until they are discovered in stored lumber, rafters, joists, floors, and furniture. More
J.L. Danet, INRA Centre de Recherches de Bordeaux, Bugwood.org
Potato Leafhopper on Woody Ornamentals - Articles Articles
The potato leafhopper has been noted on more than 200 host plants, many of which are ornamental plants. However, this insect is best known as a field crop pest. More
John Ghent, John Ghent, Bugwood.org
Periodical Cicada - Articles Articles
The periodical cicada is the longest-lived insect in North America. They are distributed over the eastern United States and occur nowhere else in the world. More
E. Bradford Walker, Vermont Department of Forests, Parks and Recreation, Bugwood.org
Pear Thrips in Pennsylvania - Articles Articles
The pear thrips is native to Europe. Since the 1980s, the pear thrips has been recognized as a forest tree pest in Pennsylvania, particularly damaging sugar maples. More
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